Fake JSON Generator — Realistic Mock Data Instantly

Pick a schema (users / products / orders / custom count), set record count, get valid JSON with believable fields — for API mocks, seed data and demos.

Quick answer: Generate realistic fake JSON for tests and demos: users, orders, products with emails, UUIDs, dates, addresses. Copy or download — generated locally.

Schema

Records

Seed

How to use

Choose schema and record count (1–5000).
Press Generate — JSON appears formatted.
Copy or download for your tests.

About this tool

Writing mock data by hand wastes hours. This generator produces structured, valid JSON with realistic values — names, emails derived from names, UUIDv4, ISO dates within ranges, prices with cents, nested addresses — using a seeded PRNG so you can reproduce a dataset. Output copies to clipboard or downloads as .json. Everything is local; nothing is sent anywhere. Your file never leaves this page — everything runs in your browser, there is no upload endpoint on this site, and the file is dropped from memory when you close the tab.

FAQ

Is data random each time?

Yes, unless you set a seed — same seed reproduces the same dataset.

Max records?

5,000 in the browser comfortably.

Valid JSON?

Always — built as objects, serialized with JSON.stringify.

Can I add custom fields?

Counts and schema are preset; for bespoke shapes, paste this output into your fixture builder.

Why seeded PRNG?

Reproducible test fixtures — same seed, same data, every run.

Rate this tool

Your rating stays in this browser (local storage) — nothing is sent to any server.

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The complete fake json generator guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Fake Json Generator — Complete Guide, Mistakes & FAQ covers all of it step by step.

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Fake JSON Generator — Realistic Mock Data Instantly

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The complete fake json generator guide